Zo vs Zomi

Zo

noun
  • An indigenous people of Burma (Myanmar) and north-east India. 

name
  • A language spoken in Myanmar and India, especially in Chin State, Mizoram and Manipur, and adjoining parts of Bangladesh. 

Zomi

noun
  • The Zou people who speak the Zou language, a Northern Kukish language. 

How often have the words Zo and Zomi occurred in a corpus of books? (source: Google Ngram Viewer )